Linux Security notes that the source to PGP 8.0 has been released under a crippling license:
Newly formed PGP Corp. took a big step Monday toward endearing itself to cryptography enthusiasts and privacy advocates by releasing the source code for its flagship line of encryption products. The code for the entire PGP 8.0 line–which was also introduced Monday–is available on the company’s Web site for free download. This move is a resurrection of the policy of openness and freedom that led to the creation of the original Pretty Good Privacy software more than 10 years ago and was a hallmark of the now-defunct PGP Inc.
Users can download and review the code for free but cannot reuse or modify it.
The article that prompted the Linux Security story is at eweek.