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SemiWiki blogger, Paul McLellan, reminisces about his PhD thesis The Design of a Network Filing System and how the challenges of designing an access control system have changed over the years.  This is especially true in today's semiconductor world that is largely divided into two groups:  large worldwide companies with big IP portfolios, and small companies with a business of selling one product, either as IP or a chip.  Companies covering this spectrum obviously need very different levels of access control, including a way to manage the semiconductor IP lifecycle where designs consist of a myriad of views, hierarchy, and a variety of requirements that don't map well onto existing source control solutions such as Perforce, Git, or Subversion that work well for software designers but not for hardware designers.

In his article, Paul expands on these challenges and provides insight into Methodics' IP Lifecycle Management solution.  You can read his blog here:  

https://www.semiwiki.com/forum/content/4186-methodics-access-controls.html