Original sentence: In most cases, the works involved are early volumes in continuing series, where readers might be likely to purchase later works in the same series.The Free Library is an experiment in electronic publishing where Flint and Jim Baen have convinced authors to post entirely unprotected free copies of various works for free download on the internet as an experiment to see if this increases the sales of their paper or (for-pay electronic) editions
Edited sentence: The Free Library is an experiment in electronic publishing where Flint and Jim Baen have convinced authors to post entirely unprotected free copies of seminal works for free download on the internet as an experiment to see if this increases the sales of their paper editions