I am not a lawyer, but that premise seems wrong to me. It seems to me that the rules may be very different from one country to another.
I emphasise that I am not a lawyer, yet it seems to me that fonts are classified as software and possibly art and may well be subject to copyright in at least some jurisdictions.
I am in the United Kingdom and maybe the law here is different from the law in some other countries, even though there is an international convention on copyright and maybe I do not understand the law correctly anyway.
There has been at least one law case over a company using unlicensed copies of fonts on computers in its offices. I do not have the details but I remember reading about it some time ago.
As you say that you do not want to violate copyrights, which is a good attitude to have, I would not want someone to mistakenly violate copyrights because of not understanding the law.
I do not understand the law myself.
What I sometimes do is look at a letter, such as, say a capital W, for various fonts in WordPad to learn the general techniques, and then design my own letter W from what I have learned.
Something I saw years ago, was a news item about a letter to a newspaper, in the days when the typesetting for that newspaper was done by phototypesetting. The letter had pointed out that the lowercase w in the text in the newspaper was back to front. The response was yes it was and a new version was now going to be obtained. It is interesting to consider the design of a lowercase w and realize how a lowercase w has a correct way round in some fonts. I like to think of the way to draw a w is that the w is constructed by first there is part of a v and then there is the whole of a v.
I like to try looking at letters and comparing and contrasting how they are drawn, for a particular letter from font to font and also for different letters within the same font. For example, considering the way that the top of the vertical in a p and in a q is drawn in various fonts. Then use that as inspiration for my own drawing. I mention that I have not been formally trained as a type designer, so that may possibly not be the official approach, I do not know, yet I find it interesting so I mention it whilst also stating the limits of my knowledge.
I hope that this helps. I write because I admire your enthusiasm and as you do not want to violate copyrights I feel that I should comment.
Finding out the definitive legal position might be a difficult and very expensive thing to do as it would need specialist legal advice.
The following link might be of interest.
http://www.ipo.gov.uk/
I searched for fonts and I have not found anything directly relevant thus far.
I am aware that it is important to learn about existing practice, yet I feel that I also wish to encourage originality and creativity.
Views may vary, yet for me I much prefer it when people produce something original, even if it is not perfectly in tune with conventional wisdom. Hopefully then helpful people will constructively suggest improvements that can be made.
I hope that this helps, yet as I say, I am not a lawyer.
William Overington
5 September 2011