A convenient way to supply a bureau with a job is to create a PostScript file with embedded fonts. This is normally a PDF(Portable Document Format) file created in such a way that the content cannot be edited or the fonts accessible for use in other documents. The whole area of font embedding, particularly with regard to web pages is of great concern to several font foundries who are at present developing software and fonts to address their concerns. So far no one has the definitive answer and we watch developments with interest. As a customer you are allowed to use programs such as Fontographer and FontLab to modify existing fonts as long as you hold the license for the existing font and the derivative is used solely by yourself. The modified font does NOT become your property and you are NOT allowed to distribute it whether for sale or reward or to be given away. The modified font still possesses all the rights as the original donor font. A big problem that companies have when settling on a modified font as their new corporate identity is that every supplier to them, every designer, every printer, in fact anyone that does anything typographically for them will need to be supplied with a copy of the modified font, this is STRICTLY ILLEGAL unless each and every user has a legal and licensed copy of the original donor font. Sometimes it is better and cheaper to have a completely new typeface designed and produced, which then does become the property of the company commissioning it, who may then distribute it freely in any way they wish. Conversions from Mac to PC and vice versa or from PostScript to TrueType and vice versa are allowed, again the same conditions apply as above. Also if you have, say, a favourite Mac font that your design department uses and you then make a PC TrueType font to use on your in-house PCs you may find you have exceeded the licensing limit of 5 computers in total and will need to obtain a further multi-user license.