"The developers of the TrueCrypt open source encryption tool are considering submitting a complaint against Microsoft to the EU Commission if Microsoft is not prepared to lay open the Windows hibernation API. From version 5.1 TrueCrypt supports hibernation for encrypted system partitions.
Potential vulnerabilities that could allow the hibernation file to be written to the disk in unencrypted form have been reported in this version in recent weeks. This would allow attackers to read the key and thus decrypt the partition or container." – Content courtesy of TrueCrypt developers consider complaint against Microsoft – News – heise Security UK