http://openaccessweek.org/

Open Access Week, a global event now entering its sixth year, is an opportunity for the academic and research community to continue to learn about the potential benefits of Open Access, to share what they’ve learned with colleagues, and to help inspire wider participation in helping to make Open Access a new norm in scholarship and research.

“Open Access” to information – the free, immediate, online access to the results of scholarly research, and the right to use and re-use those results as you need – has the power to transform the way research and scientific inquiry are conducted. It has direct and widespread implications for academia, medicine, science, industry, and for society as a whole.

Open Access (OA) has the potential to maximize research investments, increase the exposure and use of published research, facilitate the ability to conduct research across available literature, and enhance the overall advancement of scholarship. Research funding agencies, academic institutions, researchers and scientists, teachers, students, and members of the general public are supporting a move towards Open Access in increasing numbers every year. Open Access Week is a key opportunity for all members of the community to take action to keep this momentum moving forward.

Get involved. Participating in Open Access Week can be as simple or involved as you like. It can also be a chance to let your imagination have full rein and come up with something more ambitious, wacky, fun.

OA Week is an invaluable chance to connect the global momentum toward open sharing with the advancement of policy changes on the local level. Universities, colleges, research institutes, funding agencies, libraries, and think tanks have used Open Access Week as a platform to host faculty votes on campus open-access policies, to issue reports on the societal and economic benefits of Open Access, to commit new funds in support of open-access publication, and more.

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Overview of MEMS microphone technologies for consumer applications

by St.J. Dixon-Warren
Engineering and Process Analysis Manager, Chipworks

 The extraordinary success of the iPhone 4 lies in the superb integration of multiple sensor technologies in conjunction with a very slick software interface.  In a recent series of MEMS Investor Journal articles, we reviewed the 9DoF motion sensing technology used in the iPhone 4. Here we will discuss the MEMS microphones that have been incorporated into the iPhone 4, and we will then provide a review of some other MEMS microphones seen by Chipworks in recent years.  MEMS microphone suppliers apparently saw a 50% increase in shipments in 2010, and they expect to see a four fold increase by 2014.

The iPhone 4 incorporates two microphones in the body of the device, and a third was found in the headset leads.  Knowles Technology earned the design win for the two primary audio sensing microphones, one in the handset and one in the headset lead.  An Infineon fabricated microphone, likely used for background pickup for noise cancellation, was found at the opposite end of the handset body.

An iPhone 4 teardown, showing photographs and x-rays of the microphone packages, and the MEMS and ASIC die, is available from Chipworks.  In this article, we will focus on the MEMS microphone die.  We will discuss the fabrication and operation of these clever little pieces of technology.

MEMS microphones are capacitive sensing devices.  In essence, they operate like a high frequency pressure sensor.  They feature a diaphragm which is comprised of two capacitor plates that, under the influence of the sound wave, vibrate with respect to each other.  This results in variation of the capacitance, that is then amplified by an associated ASIC to produce either an analog or digital output signal.  In the case of the Knowles microphones in the iPhone 4, Chipworks believes they are analog devices, although we have not yet done a circuit analysis to prove this.  We have not been able to identify the specific Knowles part numbers used.

The two Knowles primary audio sensing microphones contain a 1.1 mm2 MEMS die, with S4.10 die markings, shown in Figure 1 below.  Chipworks has seen the S4.10 die in many different downstream products.  We believe that this MEMS microphone die is used in the majority of Knowles’ current MEMS microphone product line up, with the distinction between the various different products being determined by the amplifier ASIC and the packaging.  The S4.10 die is very simple.  It features a MEMS diaphragm with two bond pad connections, one for the top plate and the other for the bottom plate.  The S4.10 likely uses the back side of the die to form a ground connection.

S1950_KNOWLES-S410_ROT_CAL
Figure 1: Knowles S4.10 MEMS microphone die from the iPhone 4.

The S4.10 die is actually quite similar to a Knowles microphone die, with S2.14 die markings, shown in Figure 2.  It was extracted from the SP0103BE3 product by Chipworks in 2006.  The major difference is the S2.14 is 1.6 mm2, corresponding to about twice the die area when compared to the S4.10.  The 50% shrink in the S4.10 die area will, of course, approximately double the yield of devices per wafer, thus resulting in a dramatic reduction in cost.  The MEMS microphone diaphragm has essentially the same ~0.5 mm diameter on both parts; however, the S2.14 has four bond pads, one for the bottom plate, two for the top plate, and a separate ground connection. Thus, not only was the S2.14 larger and, hence, more expensive to make, its packaging and integration costs would have been higher, since twice the wire bonding was required.

SP0103BE3-5_BLOG
Figure 2: Knowles S2.14 MEMS microphone die.

A detailed view of the edge of the S2.14 microphone diaphragm is presented in Figure 3.  The top plate is covered with an array of small holes, which are required to allow air to escape from the cavity between the two plates during operation. They were also needed in the release etch step in the fabrication process, discussed below.

109853_edge
Figure 3: Knowles S2.14 MEMS die detail.

Figure 4 shows a cross section through the S2.14 MEMS microphone die. The top and bottom capacitor plates are suspended above a sealed cavity, which is formed from the back side of the die using a wet etch which was selective for the {111} plane of the silicon.  The position of the plates has been somewhat distorted by the epoxy resin used by Chipworks to stabilize the sample for cross-sectioning.

MEM_die_5x
Figure 4: Knowles S2.14 MEMS die cross section.

A detailed view of the edge of the microphone diaphragm is shown in Figure 5.  The bottom plate is formed using a single layer of polysilicon (poly 1), while the top flexible diaphragm plate is comprised of a bilayer of silicon nitride and polysilicon (poly 2), perforated with the holes.

According to iSuppli, the Knowles MEMS microphone die are fabricated by Sony Semiconductor Kyushu Corp.  The fabrication of the two membranes, separated by an air gap, would have depended on the spacer layer, likely silicon dioxide, which would have been removed during the release step through the holes in the top plate, likely with anhydrous HF.  It is most probable that the back side cavity etch was performed before this final step, probably by using a KOH wet etch.

111943_node2_3_4
Figure 5: Knowles S2.14 MEMS die cross section detail.

The Infineon MEMS microphone die found in the iPhone 4 is similar in many respects to the Knowles device.  Figure 6 shows a photograph of the 1.35 mm x 1.25 mm Infineon E2002 MEMS microphone die.  The microphone diaphragm is ~1.0 mm in diameter.  The die features three bond pads, one for the top polysilicon plate, one for the bottom polysilicon plate, and a third which connects to a polysilicon guard ring.  The Infineon E2002 die found in the iPhone is identical to that seen by Chipworks during the analysis of the Infineon SMM310E6433XT integrated silicon microphone.

1014_E2002E_MEMS_die_cal
Figure 6: Infineon E2002 MEMS microphone die from the iPhone 4.

The SMM310E6433XT is no longer advertised on the Infineon web site; however, according to iSuppli, Infineon now supplies its MEMS die to three Asian microphone suppliers, AAC Acoustic Technologies Holdings Inc., BSE Co. Ltd., and Hosiden Corp.  These three suppliers, along with Knowles and Analog Devices, constitute the top five suppliers in the MEMS microphone market, with Knowles apparently holding nearly 80% of the market.

As an aside, it is worth noting that Analog Devices won the design win for the microphone in the fifth generation Apple iPod Nano (the new sixth generation Nano does not contain a microphone).  It is interesting that Analog was not able to win a socket in the iPhone 4.  Knowles and Analog Devices have recently concluded patent litigation, with the judge ruling in Analog Devices’ favor.

Figure 7 presents a photograph of the 1.0 mm x 1.0 mm Analog Devices MEMS microphone die found in the ADMP403, extracted from the iPod Nano (fifth generation).  Apparently, a major part of Analog’s strategy to avoid infringement on Knowles’ patents was to base the fabrication of this device on its well established iMEMS process.  The iMEMS process has been in use for many years for the production of inertial sensor products.

ADMP403_IP696_4-8H_MEMS_cal_rot
Figure 7: Analog Devices 4.8H MEMS microphone die from the iPod Nano.

MEMS microphones have evolved into a mature commodity product.  The market is highly competitive.  There are a number of other manufacturers, such as Akustica and MEMSTech, who continue to produce MEMS microphone products.  Akustica microphones are of particular interest to the MEMS community, since it was the first company to produce a CMOS-based MEMS device.  The MEMS diaphragm is formed using etch and release of the CMOS metallization layers.  Figure 8 shows a SEM micrograph of the Akustica AKU2000 microphone diaphragm, which is formed using a serpentine pattern in the CMOS “metal 1” layer.  A benefit of this approach is the ability to easily integrate signal processing circuitry onto the same die, thus allowing for single chip solutions.  Akustica was acquired by Robert Bosch GmbH in August 2009.

106_membrane_edge_new
Figure 8: Akustica AKU2000 microphone diaphragm.

Chipworks expects to see continued innovation in the MEMS microphone market.  The innovation is likely to occur in the signal processing ASIC and the packaging, rather than in the MEMS part of the product.  After all, Infineon has done rather well selling its original MEMS die to multiple microphone suppliers.  There may not be a “Moore’s Law” governing the size of MEMS microphone devices, since the physics of sound require that the microphone diaphragm be large enough to interact with pressure variation induced by the sound waves.  At 10 kHz, the wavelength is 34 mm, which is already much larger than the typical 0.5 mm diameter being used in commercial MEMS microphones.  The diaphragm needs to be large enough, for a given plate thickness, such that the pressure variations from the sound waves for a human voice induce sufficient displacement of the capacitor plates to give a suitable signal for the ASIC amplifier.  We can expect circuit designers to continue to make innovations in the design of the ASIC, thus creating lots of new work for the reverse engineer.  Designers will likely move towards the integration of an ADC and digital signal processing within the microphone amplifier ASIC.

*********************************************

St. J. (Sinjin) Dixon-Warren manages the Process Analysis group in the Technical Intelligence business unit at Chipworks.  His group provides technical competitive analysis services to the semiconductor industry, currently with a special focus on the analysis of MEMS, CMOS images sensor, advanced CMOS and advanced power devices.  He is the Sector Analyst for MEMS analysis at Chipworks.  Dr. Dixon-Warren holds a PhD in physical chemistry from the University of Toronto and a BSc in chemistry from Simon Fraser University.  Dixon-Warren joined Chipworks, in 2004, as a member of the process analysis group.  He is author of about 50 publications and of about 100 Chipworks reports.  Dr. Dixon-Warren can be reached at sdixonwarren@chipworks.com.

Copyright 2011 MEMS Investor Journal, Inc.

March 08, 2011 at 05:26 PM | Permalink

 

<from http://www.memsjournal.com/2011/03/overview-of-mems-microphone-technologies-for-consumer-applications.html&gt;

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French parallel processing research wins €32m funding

June 21, 2012 // Peter Clarke

French parallel processing research wins €32m funding

The ManyCoreLabs three-year collaborative R&D project, proposed by French fabless chip company Kalray, has been selected to receive €32m (about $40m) in funding from the French authorities as part of the Investissements d’Avenir (Invest in the Future) program.

 

The project is set to run from 2012 to 2015 and is intended to address the “manycore” platform market for embedded systems. ManyCoreLabs is expected to provide high performance generic embedded computing platforms with a reduced cost and design time compared with currently available solutions.
The project is led by Kalray, a 2008 startup company led by Joel Monnier, a former vice president of central R&D at STMicroelectronics. Kalray has already designed a 256-processor SoC, the MPPA-256, implemented using 28-nm manufacturing process technology. The 256 processors work in parallel and communicate together via a network-on-chip just as large clusters of computers do on the Internet. The MPPA-256 is organized as 16 clusters of 16 processors and multiple MPPA chips can be interconnected at the PCB level through Interlaken interfaces to increase the processor array size and performance capability.
Other participants in the ManyCoreLab project include: Asygn, Ateme, CAPS Entreprise, CEA, Digigram, Docea Power, Inria, IS2T, Krono-Safe, Renault, Scilab, Thales and Verimag.
Kalray exhibited Europe’s first 28nm processor in October 2011 at the Grenoble Innovation Fair where it was able to demonstrate the interactive debugging of an H.264 video encoder model running on just 16 cores.
Kalray is exhibiting at the 3-D Reality Exposition whch takes place in Tokyo, June 20 to 22, where it plans to show augmented reality applications for industrial environments running on its platform.
“Augmented reality applications use highly parallel algorithms executing perfectly on the massively parallel structure of the MPPA,” Kalray claims on its website.
Kalray was founded in July 2008 and has raised more than $20 million in venture capital and lists a design team of 50 engineers as well as access to 30 researchers working in joint laboratory with CEA-Leti in Grenoble. The company also claims to have amassed a portfolio of 45 patents.
www.kalray.eu

 

<from http://www.electronics-eetimes.com/en/french-parallel-processing-research-wins-32m-funding.html?cmp_id=7&news_id=222912976&gt;

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About the Kaldi project

What is Kaldi?

Kaldi is a toolkit for speech recognition written in C++ and licensed under the Apache License v2.0. Kaldi is intended for use by speech recognition researchers. For more detailed history and list of contributors see History of the Kaldi project.

download and more <http://kaldi.sourceforge.net/about.html&gt;

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The Researcher’s Bible

see here <http://homepages.inf.ed.ac.uk/bundy/how-tos/resbible.html&gt;

and here <http://macerich.wordpress.com/2012/05/16/the-researchers-bible/&gt;

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Digital MEMS microphone array DMMA.3

.. is now recording. See it and get your sample here

<http://homepages.inf.ed.ac.uk/s9903055/&gt;

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Anywhere working: Finding the office of the future

21 February 2012 Last updated at 06:36

 

By Fiona Graham Technology of business reporter, BBC News
 
The future office
In the 1930s the office of the future was all about ‘flying chairs’. Where is technology taking us in the 21st century?

The world of classical music doesn’t immediately conjure up visions of a bright new technological dawn.

But just as a company needs to invest in technology to keep a mobile, flexible workforce competitive, so does a world-class orchestra. It is, after all, a business like any other.

The London Symphony Orchestra (LSO) has 80 musicians who travel the world performing and recording, and a staff of 75 who run the office, their London venue, music label, and education division.

“For a lot of the time the orchestra is away from the Barbican, which is our main base,” says Jeremy Garside, the LSO’s head of technology.

“Their support team, particularly the orchestra managers who look after the day-to-day running of the orchestra, are probably away two-thirds of the time from our core base.”

The London Symphony Orchestra The London Symphony Orchestra travels the world performing – making technology that can keep them connected to the office in London vital

The need to upgrade the organisation’s ageing telephony network and IT infrastructure gave them the chance to introduce flexible working on the move.

“If you’ve got a session in Abbey Road studios, or a film recording session, or are in an airport, it isn’t always possible to get through on a mobile, they’re often switched off,” says Mr Garside.

Getting rid of ISDN lines has produced cost savings, and the ability for the management team to log on to their laptops and make decisions in real time whether in New York, Beijing or London has made the organisation more agile, says Mr Garside.

This might not seem to be a particularly new scenario.

But there’s a growing body that sees this as the first steps to a vision of the future workplace, where, thanks to technology that keeps us constantly connected to the office, the office is where you are.

So how does this particular version of the future work?

Anywhere working

Technology giant Microsoft and its advisory panel, the Anywhere Organisation, advocate a more flexible, horizontal organisation.

As part of this, the company has put its money where its mouth is and is in the process of rolling out fundamental changes to the way some of its European offices function.

The catalyst for this was its Dutch office in Amsterdam.

The general manager there, Theo Rinsema, was faced with a cramped office environment and a workforce who were selling a philosophy to customers that had little to do with the way they themselves were working.

Microsoft Amsterdam
At Microsoft’s Amsterdam office staff have no fixed desks, and choose where to sit depending on the type of work they have to do that day

He decided that the best way to sell an idea was to show it in practice.

This meant a new, custom-designed office, a big investment in unified communications and cloud computing, as well as employee training and support.

Staff – including Mr Rinsema – no longer have a desk, and are encouraged to decide where they work that day based on the tasks they have to do.

This could be in the open area on the first floor that includes a restaurant, coffee bar, meeting rooms and breakout areas, a private room on another floor or a hot desk.

They are also encouraged to work from home where possible. Line managers work with staff to draw up delivery schedules and expectations.

Microsoft’s Klaus Holse says there are a number of things to consider.

“You’ve got to be thoughtful about what you’re doing, because not all positions in a company are created equal.

“If you’re in the HR department for example, the physical requirement for you to be at the office is probably higher than if you’re a consultant.”

Being clear on what is appropriate when working from home is also important, says Mr Holse.

The result, according to Microsoft, has been a happier workforce, increased productivity and higher sales as well as cost savings. The new office has half the floor space of the old one, but capacity isn’t an issue.

Connecting the workforce

Microsoft isn’t alone among technology giants in predicting a flexible future for the average office worker. Dell recently published the second report in a series on what it calls the evolving workforce.

“I think the workplace of the future to me looks like a connected, enabled, empowered knowledge worker,” says Dell’s Bryan Jones.

“[It’s] an employee who is less bound by physical location, by conventional work hours, and the performance of that employee is judged more by the output and indexed towards quality of output rather than the number of hours worked.”

The study found that developing economies such as China, Brazil and Mexico had been quickest to adopt flexible practices. One reason for that is a lack of existing IT infrastructure, says Mr Jones.

“They’re able to skip a generation of technology and go directly to it. I think it speaks to the entrepreneurial spirit that we are seeing in developing countries as well.”

Mr Jones believes that companies that fail to adopt a more flexible approach risk being unable to attract the brightest and best.

“I would say that companies that are categorically saying they’re not willing to embrace these types of opportunities, I would say you’re going to miss out on a level of employee-led innovation that will be debilitating to you long-term.”

However the research also highlighted the fact that it was not just the younger generation that was pushing for different ways of working.

“What we found was that there was a gap between the technology savvy and non-technology savvy,” he says.

“It really doesn’t matter what age group you’re in, it really depends more on how the individual employee or user has embraced technology.”

Carbon trading

It’s not just technology companies that are keen to promote more flexible ways of working. For conservation charity WWF this means helping companies reduce their carbon footprint.

“All companies are concerned about their bottom line. And one of the biggest items of cost for a lot of companies is business travel,” says Jean Leston, senior transport policy adviser for WWF UK.

Jean Leston
Jean Leston says video conferencing saves money and means a better work/life balance for staff

“And if there are ways you can cut that means you can save money. And the cost of business travel is only going to increase with the cost of oil.”

The charity works with the Anywhere Working Consortium, a body that includes companies like Microsoft, Nokia and Vodafone, to promote home-working and video conferencing among other things.

“If you’re working collaboratively but using technology instead of face-to-face meetings you’re able to meet more often, and you’re able to make decisions faster, so you can get your products to market faster.”

The charity is in the process of building new offices, where remote working will be encouraged – as will public transport, as there are no parking facilities.

Changing containers

This is just one possible version of the future – and it’s one that is probably most applicable to the knowledge – or office – worker. A manufacturing production line is unlikely to relocate to your front room anytime soon, for example.

For some businesses, allowing staff so much free rein may seem like a step too far, and for others dealing with sensitive customer data, too risky.

But for Philip Ross, chief executive of Unwork.com, the evolution is not complete.

His organisation studies attitudes towards work, and has just completed its 2012 Unwork.com annual survey.

“Work is very much housed in a container and that container has been around for about 120 years, at the white-collar workplace.

“And by and large most people still commute day in and day out to a container for work.”

This year’s survey found that 71% of respondents had not adopted home-working or telecommuting, citing the fear of isolation and the need to be seen in the office.

“What that says to me is that people still want to get out of the home, they don’t want to be home-workers, they want to come in and they need that kind of buzz.”

This doesn’t mean we will stay in the office environment though. Philip predicts that as well as home-working, people will use other spaces to congregate and work outside the office. With around 45% of office desk space vacant at any one time, according to Unwork.com, this could lead to significant savings.

“I think that you will find a different set of rules. The office will still remain the brand, [but] it will be the representation of the business, the anchor point and the place for people to come to do prescribed tasks.”

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SFEP rules for writers

1. Verbs HAS to agree with their subjects.

2. Prepositions are not words to end sentences with.

3. And don’t start a sentence with a conjunction.

4. It is wrong to ever split an infinitive.

5. Avoid cliches like the plague. (They’re old hat.)

6. Also, always avoid annoying alliteration.

7. Be more or less specific.

8. Parenthetical remarks (however relevant) are (usually) unnecessary.

9. Also too, never, ever use repetitive redundancies.

10. No sentence fragments.

11. Contractions aren’t necessary and shouldn’t be used.

12. Foreign words and phrases are not apropos.

13. Do not be redundant; do not use more words than necessary; it’s highly
superfluous.

14. One should NEVER generalize.

15. Comparisons are as bad as cliches.

16. Don’t use no double negatives.

17. Eschew ampersands & abbreviations, etc.

18. One-word sentences? Eliminate.

19. Analogies in writing are like feathers on a snake.

20. The passive voice is to be ignored.

21. Eliminate commas, that are, not necessary. Parenthetical words however
should be enclosed in commas.

22. Never use a big word when substituting a diminutive one would suffice.

23. Kill all exclamation points!!!

24. Use words correctly, irregardless of how others use them.

25. Understatement is always the absolute best way to put forth
earth-shaking ideas.

26. Use the apostrophe in it’s proper place and omit it when its not needed.

27. Eliminate quotations. As Ralph Waldo Emerson said, “I hate quotations.
Tell me what you know.”

28. If you’ve heard it once, you’ve heard it a thousand times: Resist
hyperbole; not one writer in a million can use it correctly.

29. Puns are for children, not groan readers.

30. Go around the barn at high noon to avoid colloquialisms.

31. Even IF a mixed metaphor sings, it should be derailed.

32. Who needs rhetorical questions?

33. Exaggeration is a billion times worse than understatement.

34. Avoid “buzz-words”; such integrated transitional scenarios complicate
simplistic matters.

And finally…

35. Proofread carefully to see if you any words out.

 

<also from http://www.utexas.edu/courses/stross/ant307_files/writing.htm&gt;

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Useful Research Phrases

<from http://www-psych.stanford.edu/~pinto/phrases.html&gt;


IT HAS LONG BEEN KNOWN = I didn't look up the original reference.

IT IS BELIEVED THAT = I think.

IT IS GENERALLY BELIEVED THAT = A couple of other guys think so too.

OF GREAT THEORETICAL AND PRACTICAL IMPORTANCE = Interesting to me.

A HIGHLY SIGNIFICANT AREA FOR EXPLORATORY STUDY = A totally useless
topic selected by my committee.

THREE OF THE SAMPLES WERE CHOSEN FOR DETAILED STUDY = The results of
the others didn't make any sense.

A CAREFUL ANALYSIS OF OBTAINABLE DATA = Three pages of notes were
obliterated when I knocked over a glass of beer.

TYPICAL RESULTS ARE SHOWN = The best results are shown.

THE MOST RELIABLE RESULTS ARE THOSE OBTAINED BY JONES = He was my
graduate assistant.

A DEFINITE TREND IS EVIDENT = This data is practically meaningless.

A STATISTICALLY ORIENTED PROJECTION OF THE SIGNIFICANCE OF THESE
FINDINGS = Wild guess.

CORRECT WITHIN AN ORDER OF MAGNITUDE = Wrong

THESE RESULTS WILL BE SHOWN IN A SUBSEQUENT REPORT = I might get
around to this sometime if I'm pushed.

WHILE IT HAS NOT BEEN POSSIBLE TO PROVIDE DEFINITE ANSWERS TO THESE
QUESTIONS = An unsuccessful experiment, but I still hope to get it
published.

IT IS CLEAR THAT MUCH ADDITIONAL WORK WILL BE REQUIRED BEFORE A
COMPLETE UNDERSTANDING OF THE PHENOMENON OCCURS = I don't
understand it.

IT IS HOPED THAT THIS STUDY WILL STIMULATE FURTHER INVESTIGATION
IN THIS FIELD = This is a lousy paper, but so are all the others
on this miserable topic.

THANKS ARE DUE TO JOE BLOTZ FOR ASSISTANCE WITH THE EXPERIMENT
AND TO GEORGE FRINK FOR VALUABLE DISCUSSIONS = Blotz did the work
and Frink explained to me what it meant.

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Open source software licences explained

If you are planning to publish some software as open source code, you need to include a licence so that other people will know what they can do with it.

(Even if you don’t care what people do with it, you should make that clear through a licence. The default copyright regime in most countries won’t permit anyone to make any legal use of your source code otherwise.)

Putting a licence with your code is easy, typically just involving adding a single file in your source code project or a few lines at the top of each source file.

Read on at http://soundsoftware.ac.uk/open-source-software-licences-explained

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