had some luck w/cold calling but had a question about DNC

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I had a question about cold calling and it may be better to contact an attorney but I thought some insight might be found here. For people on the DNC list I'm assuming its to not sell or pitch a product or service. Im calling and asking/telling them that I buy houses and ask them if they have a house for sale. Should I be concerned with the DNC list and reference it? I don't see a difference between calling and sending a yellow letter or postcard to them to see if they have a house they might be willing to sell. Thanks for your feedback.