Subject Re: [Firebird-general] So, who invented shadow records?
Author Daniel Rail

At February 21, 2005, 12:30, Martijn Tonies wrote:


Just to follow Ann's message(found in Craig's blog) in regards to
software patents.

Even more ridiculous, is that there are patents that have been filed
recently that describes some features of Firebird.

- Multi-versioning Concurrency was filed by Borland on Dec 14,
2000(quite interesting). And, there's another company that filed a
similar patent not even 2 years ago.
- "Method for managing distributed savepoints across multiple DBMS's
within a distributed transaction" was filed by IBM in May 2001, and
reading the description, it sounds very much like the 2-phased commit
that Firebird uses.

Best regards,
Daniel Rail
Senior System Engineer
ACCRA Group Inc. (
ACCRA Med Software Inc. (