No business entity shall engage in practices of resale price maintenance; provided, this shall not apply in any of the following cases:
1. Where there is good cause for practices of resale price maintenance, such as when the effect of increasing consumer welfare due to the increase in efficiency is greater than the negative effect of restricting competition;
2. In cases of published works (including electronic publications) publicly notified by the Fair Trade Commission after consultation with the heads of the relevant central administrative agencies among works defined in subparagraph 1 of Article 2 of the Copyright Act.