Below is an excerpt from the Paypal Acceptable Use Policy:
PayPal Acceptable Use Policy
Last Update: Oct 24, 2011
You are independently responsible for complying with all applicable laws in all of your actions related to your use of PayPal's services, regardless of the purpose of the use. In addition, you must adhere to the terms of this Acceptable Use Policy.
You may not use the PayPal service for activities that:
violate any law, statute, ordinance or regulation.
relate to transactions involving (a) narcotics, steroids, certain controlled substances or other products that present a risk to consumer safety, (b) drug paraphernalia, (c) items that encourage, promote, facilitate or instruct others to engage in illegal activity, (d) stolen goods including digital and virtual goods (e) items that promote hate, violence, racial intolerance, or the financial exploitation of a crime, (f) items that are considered obscene, (g) items that infringe or violate any copyright, trademark, right of publicity or privacy or any other proprietary right under the laws of any jurisdiction, (h) certain sexually oriented materials or services, (i) ammunition, firearms, or certain firearm parts or accessories, or (j) ,certain weapons or knives regulated under applicable law.