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Hi, We are actually working on a new product information section for our network of websites (site A, B, C and D) where product landing pages allow to download information in pdf format and are active for downloads during a period of two months (active form for commercial reasons) with a unique URL (the case today). Here is a possible scenario for these product landing pages in the near future: Product is promoted in website A during 2 months (January to February) so canonical URL = A/page. Once expired, the product info. download form disappears. Customer decides to promote the same product in the same site A as well in site B from April to May so canonical URL will still be A/page. Canonical URL of B/page will point to A/page. Customer decides to relaunch his product promotion this time in site C from July to August so canonical URLs of pages A/page and B/page will now point to C/page as the latter will be the only product campaign active with a download form At the end of the year the customer does another campaign for the same product this time in website D so we will change the canonical URL of pages A/page, B/page and C/page to D/page as the latter will be the only product campaign active with a download form The obvious question here is: will this way of changing canonical URLs dynamically hurt the SEO of the section, pages, one particular website or the whole network ? Would it be better and safer to just keep the first canonical URL forever? A/page in this example Thanks so much for your input on this.